Flume screen



G. R. RODDY FLUME SCREEN Nov. 1 1924- Filed Oct. 5, 1922 2 Sheets-Sheet1 NOV. i 4924' j G. R. RODDY FLUME SCREEN Filed Oct. 5. 1922 2 Sheets-Sheet 2 Patented Nov. 11, 1924.

UNITED GUSTAV R. RODD'Y,'OF MILWAUKEE, :WISCONSIN, ASSIGNOR TO CHAINBELT,1CQMPANY,

OF 'MILWAUKEE, WISCONSIN, A'GORPO'RATION OF WISCQ-NSIN.

ELU ME SCREEN.

A p1ication filed flctober 5, 1922. gSerial No. '5 92,508.

To-aZZ whom it may concern:

i Beitdrnown that l, GUSTAV :R. Ronny, a citizen of the Unitedistates,residing at Milwaukee, in the county 'or ,Milweukee land 5 State ofdVi-sconsin, have invented certain :new and useful Improvements in FlumeScreens, oiiwhich the following is especification.

lihis invention relates to ,fiume screens such i'asyare used; to;.remove from sewage and waters used for industrial purposes the largerparticles of solid material found therein. It has forjitsobject toimprove the apparatus employed in l -such screens in such way :estoreduce {1L0 n mlnimum the leakage of water, thatis, the pessege there-.ofaroundythe screen rather than through it.

In intent 31,208,655, issued to Ghain Belt GO-mpany ,o-f xlvfilwankee, is essignee (if-B. 2o -Reynolds da-ted {December 12, 119,116, there 1s 1shownia wflume screen having aneny features in common with tllQmOIiBillustrated in the ieccompa-nying drawings ;;as embodying the present,;i;nvention. ,-The -;screen shown 1n thatupatent, which is of the-end1ess, traviieling type, comprises a SGI'lBSFgOf s eparate :screengsections rectangular in o u e zcured at :their edges to endlesssprocket W chains. The dlillkSgOf {these J chains :are :each preferablyformed octlpara llel spacedea part -tside zbars "JCOHDQC'EGCl at: the" onts of 'itlle gchein i'floy pintles or crOss :pins. in the 1usetofgsuchzSCr en 'itchasi been fou d tha a there is :some eleekege :oi(:the unscrewed .Jiquid :past: the. suhm rgedend a hc e z ve*whenzprovidedwith the means illustrated and iidescribed @iii 5 theaforesaid patent for preventing 1; such le kage .lThe sprescnt inventionhasr for its ,obj ect ;to further. improve 40 the-mechanismof the screenso that? the reliaitive emountoof suchleekage ,is very much reduced.

In xtheiaccompenying drawings- 7 Figure gl is nvertical sectional Viewiofthe lower portion of a fiunie; screen embodyingvtheimprovements.which comprise the inVen- 131011?OfiillBIiPI'BSQllhcase.

Fig. i2 is as, :trensverse sectional View through 1 one of the, driveoheins and of :the parts oftheiap paretus,immediately adj acent'tosuch:ichein, :t'eken on, the line; II+II 10f aFiigi 1.

1Fig.;:.3 ise similersectional view-taken on o the line :III-III ofFig.,1,- and Fig. 4

another sectional view taken on the line ,I'VIViof Fig. 1.

Fig. 5 is enelevetionof the screen epperetus shown inFig. 1 paits beingb li away leaving only one side of the screen and aghacent -perts of theframeworkto be illustrated.

In the accompanying drawings 2 indicates; oneof theflerge sprocketwheels sup ported in the lower endof the screen framework, 3, aboutwhich the endless screen turns,,end by which it is supported. The screenis formed ofja, series ofseparate articulated sections at, 4, connectedat their opposite edges to chains 5 which engegewith pivotally united:by the pintlesor connecting pins 18, ,On which ere mounted, between theside bersfiitherollers 9. The'screen ;-se@tion 4 er sep erte by r angu aframes 12 whichiare secured at their opposite tends to the chains 5.Each self-Ben section is represented as being provided withe basket lip10. errangedto receive onaterialthat has been co llected'by the screensection ,and which may fall therefrom as the section. leaves thesurfaceof thegliquid on its upward movement.

The ;;perts thus "far described ere well known in the art and-need notbe here I de scribed in detail, -fOrY- aQspecific description endillustrztthm' thereof is .found in the eforesaiidf Patent 12085655.

Belowithevsprocket wheel is in curved guard :11, extending i the fullwidth of the screen and in proximity to which the screen sections movensthey: make their turn 2 about the sprocket wheel. This guard serves toprevent 'the'passege of unscreened liquid doelow the screen, asdescribed in the aforesaid patent. 14,;14 represent the guards carriedby the framework ,3 and 1 extending over the chains. and the: extreme.side; edges of the screen sections, and' i-between which lie thebasketlips 10, these. parts heing su-bstantiallythe sa-me as the correspondingpartsillustrated in the aforesaid patent.

As has been suggested, even when the guards 14- are employed some of theunfiltered water will pass between their edges and the screen sections,when it will find free passage between the side bars 6 of the chainlinks above the sprocket wheels 2, thus escaping the filter or screen.In order to reduce this possibility, bars 15 are supported directlyopposite the edges of the chains 5, and as close to these as goodworking conditions will permit. These bars are carried by the guards 14,being secured thereto by bolts 16 and held in proper position by thespacing pieces 17. It has been found in actual practice that these barsvery materially reduce, the tendency of theliquid to pass around theedges of the screen, since they materially restrict and make tortuousthe passage that must be followed by any liquid escaping the screen bythe course indicated.

It will be seen by reference to the drawings, particularly Figs. 2 to 5,inclusive, that the guards 14 extend inward sufiiciently far to overlapslightly the screen sections as they pass, while the bars 15 are locatedentirely outside of the screen sections, lying opposite the outer edgesof the sprocket chains 5, this arrangement permitting the bars 15 to bebrought closer to the edges of the chains than it is possible-to locatethe guards 14.

As will be seen by reference to Fig. 1 the sprocket teeth 7 of thewheels2 are of a size to substantially fill the open spaces between the sidebars 6 and the rollers 9. The

' lower, submerged, sprocket wheels 2 are formed with outwardlyprojecting flanges 21 at thebases'of the teeth 7 upon which the sidebars 6 of the links of the sprocket chains may rest as they pass aboutsaid wheels. The edges of said flanges 21 may also run very close to theside walls of the boot in which the lower end of the screen is mounted,when such a boot is employed, as'is frequently the case. Thisarrangement practically closes the open spaces through the links afterthe chains engage with the wheels 2 and, since the sprocket teethproject be-- yond the outer faces of the links and run close to theinner faces of the bars 15 as the chains and screen sections make theirlower turn, there is very little flow of unfiltered liquid outside thescreen. i

The bars 15 extend upward on that side of the screen where the waterenters sufficiently far to guard and protect the chains 5 until theyengage with the track bars 20,

which are located on the inner sides ofthe chains and as close theretoas is permitted by reason of the engagement therewith of the rollers 9of the chain. These track bars serve to prevent free transverse flow ofliquid through the chain; The bars 15, from their upper ends oppositethe track bars 20,

extend thence downward and under the wheels 2, concentric with the lowersegments thereof, and to some convenient point on the flow side of thescreen, where they are secured, as at 18, to the supporting framework.Filling blocks 19, preferably of wood, are interposed between the bars15 and the lower guard 11.

What I claim is 1. In a flume screen of the endless, traveling type,comprising screen sections and sprocket chains to which the ends of thescreen sections are secured, the combination with the submerged end ofthe screen and the means that cause it to make the lower turn, of meansarranged to cover the lateral edges of the screen and the chains torestrict the flow of unscreened water around the side edges of thescreen, and guards inside the said restricting means arranged close toand opposite the outer edges of the supporting chains arranged torestrict the passage of unfiltered water that may escape around theedges of the screen through the chains.

2. The combination stated in claim 1 having the guards secured to andsupported by the said covering means.

3. In a flume screen of the endless, traveling type, the combinationwith supporting sprocket wheels adapted to be submerged in the liquid tobe screened, sprocket chains engaging with the said wheels with openspaces through them for the teeth of the sprocket wheels such teethbeing of a size to practically fill the open spaces through the chainlinks when the latter engage therewith and to project beyond the outeredges thereof and the sprocket wheels being formed with outwardlyextending flanges across the bases of the teeth, and screen sectionscarried by, the chains, of guards for restricting the passage ofunfiltered water that may escape around the edges of the screen throughthe chains, which guards are arranged opposite the outer edges of thechains on the side of the screen where the screen sections are secured,the combination with the submerged end of the screen and the lowersprocket wheels with which the chains engage, the screen sections beingprovided with lips for carrying upward mate-' rial taken from the liquidby the screen which may drop from the latter as they leave the liquid,of a curved guard arranged below the submerged end of the screen closet0 the inner face of which the edgeso'f the filtered Water enters aroundthe submerged carrying lips move as the screen makes the lower endconcentric With the said curved lower turn, guards arranged close to andguard, and filling blocks between the curved 10 opposite the outer edgesof the chains to guard and the lower portions of the guards restrict thepassage of unfiltered water for the chains.

through the chains the guards extending from the side of the screenWhere the un- GUSTAV R. RODDY.

